bug(mat-select): won't collapse on IOS with a full access keyboard

[denisesy]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

When an iPhone user is navigating using a Bluetooth keyboard to open up the dropdown. The user won't be able to collapse the dropdown when tabbing away. This is introducing an ADA issue, as the dropdown will block the content behind it.

Reproduction

Steps to reproduce:

1. Connect your iPhone to a Bluetooth keyboard, and enable "Full Keyboard Access" in settings
   
2. Got to https://material.angular.io/components/select/examples
3. Open any dropdown and use keyboard to tab away
4. Focus moved to the next control and dropdown panel is still open

Expected Behavior

Dropdown should be collapsed when user tabs away using keyboard

Actual Behavior

Focus moved to the next control and dropdown panel is still open when user tabs away

Environment

• Angular: 17.3.0
• CDK/Material: 17.3.6
• Browser(s): Safari, Chrome, etc.
• Operating System (e.g. Windows, macOS, Ubuntu): iPhone